48 lines
1.2 KiB
C++
48 lines
1.2 KiB
C++
#ifndef _GWBUFFER_H
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#define _GWBUFFER_H
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#include <string.h>
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#include <stdint.h>
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#include "GwLog.h"
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class GwBufferWriter{
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public:
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virtual int write(const uint8_t *buffer,size_t len)=0;
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virtual ~GwBufferWriter(){};
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};
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/**
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* an implementation of a
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* buffer to safely inserte data if it fits
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* and to write out data if possible
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*/
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class GwBuffer{
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public:
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static const size_t BUFFER_SIZE=1620; // app. 20 NMEA messages
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typedef enum {
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OK,
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ERROR,
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AGAIN
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} WriteStatus;
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private:
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uint8_t buffer[BUFFER_SIZE];
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uint8_t *writePointer=buffer;
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uint8_t *readPointer=buffer;
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size_t offset(uint8_t* ptr){
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return (size_t)(ptr-buffer);
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}
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GwLog *logger;
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void lp(const char *fkt,int p=0);
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public:
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GwBuffer(GwLog *logger);
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void reset();
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size_t freeSpace();
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size_t usedSpace();
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size_t addData(const uint8_t *data,size_t len);
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/**
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* write some data to the buffer writer
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* return an error if the buffer writer returned < 0
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*/
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WriteStatus fetchData(GwBufferWriter *writer, bool errorIf0 = true);
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};
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#endif |